Main specifications
Material
Polyamide based (PA) technopolymer.
- Cover: RAL 2004 orange, semi-matte finish, with graphic symbol "valve".
- Threaded fitting with splash guard: black, semi-matte finish.
Packing ring
NBR synthetic rubber.
Overpressure valve
Technopolymer with NBR synthetic rubber O-ring and stainless steel spring.
Set at around 0.350 bar.
Suction valve
Technopolymer sealing disk in NBR synthetic rubber and stainless steel spring.
Set at around 0.030 bar.
Air filter
Thermal-bonded polyester (TBP) filter with low pressure drop and high dust holding capacity. Expected filtration class ISO 16890-1 ISO Rating coarse 75%, EN 779:2012 Class G4, air filtration 10 µ.
Flat dipstick
Flat section phosphatised steel.
On request and for sufficient quantities dipstick can be supplied in different lengths and/or complete with MAX-MIN level lines.
Maximum continuous working temperature
100°C.
General information
Features
The SFW-P+a cap maintains a reservoir of air under pressure above the oil level within the limits established in the design stage to avoid deformation of the tank walls. Benefits:
- it reduces reservoir air volume intake keeping clean oil and filter;
- it improves suction pump action during working conditions reducing cavitation phenomenon;
- it prevents fluid leakage when the system is part of a mobile unit;
- it reduces foam in fluid.
SFW-P+a caps are made with a special internal geometry which stops the leakage of the fluid to the outside.
Technical data
Air flow rate for the different executions of breather caps can be obtained from the diagram on the basis of the difference of air pressure inside and outside the reservoir.
Working in an hydraulic circuit
